Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 552:
1939, large die proof of 10c in dark green, imprint ”Special Delivery” and ”X-G-673” at bottom, proof size 106x85mm, printed on India and mounted on slightly enlarged card with protective paper overlay, no gum as produced, VF and very scarce, NSSC SD 9dp2, C.v. US $1,000, Est. $600-$800, Scott #E7
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